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Old 4th February 2004, 07:47 AM   #1
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Default Stuck on reclocking part of Doede's 1543 DAC

Finished my Doede's DAC 1543 last night..!!! What an incredible musical DAC. Instruments sound like real instruments...Am chuffed!

However the re-clocking part does not work...only change I made is a 100R resistor going from the Tent clock...could that be it..?

All I hear when I have the re-clocking switch on is absolute silence...

Any pointers?

Regards
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Old 4th February 2004, 08:10 AM   #2
Lucas_G is offline Lucas_G  Netherlands
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Hi Bas,

You did shorten all three switches?

Furthermore did you check the connection from plus 5 Volt going to Tents clock... I use an IC-mount and had to connect the 10 mm distance from the upper left pin of the mount to the upperleft pin of the clock...

What is strange in my case is that reclocking sounds less musical

Maybe it has to do with all that cabling. I have some 20 cm of wires connected to all the switches, so the signal has to travel a long way outside the pcb when reclocking. When I have done the enclosure I will try using short cables on the switching-pins. Maybe then reclocking will bring benefits...

Regards,

Lucas
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Old 4th February 2004, 08:53 AM   #3
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Hi Lucas,

Quote:
You did shorten all three switches?
Yep.

Quote:
What is strange in my case is that reclocking sounds less musical
Good news...that means if it does not work out ...it is geen ramp

Quote:
Maybe it has to do with all that cabling.
You mean the sound in your case ....could very well be! In my case it can't be..I shorted it directly

Thanks,
Bas
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Old 4th February 2004, 09:11 AM   #4
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In my case the reclocking made the difference - in positive - even if it was Elso's ASR and not like Doede's.

The obvious checks need a oscilloscope: check the oscillator output and look at the signals you are going to reclock before applying the reclock, and then look if you see the same signals after.

Make also sure that you set the correct CS8412 mode when reclocking.

And -last but not least- where are the pics??

Cheers

Andrea
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Old 4th February 2004, 09:22 AM   #5
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Show me yours first! And I'll show you mine!

Just kidding

Will post some pics tomorrow..(just breadboard stage)

Regards,
Bas

Have no scope

Is either the tent clock or that other thing very sensitive to soldering or electrostatic charges?..

PS I still have an unfinished clock 6..from Elso lying about..Maybe I should try that...gotta buy a crystal first though...

Cheers,
Bas

PS
Quote:
Make also sure that you set the correct CS8412 mode when reclocking.
How do I do that?
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Old 4th February 2004, 11:33 AM   #6
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What type of resistor are you guys using by the way for the I/V conversion?
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Old 4th February 2004, 12:16 PM   #7
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Quote:
Show me yours first! And I'll show you mine!
I already posted mine, just have a little search!

Quote:
Have no scope
That's bad news... at least check the DC level.. if you have the same signal the DC level should be the same...

Quote:
Is either the tent clock or that other thing very sensitive to soldering or electrostatic charges?..
Don't know about the static sensitivity of the oscillator, however to be sure that is is working you should get a 2.5V DC level at its output (50% Duty cycle square supposed).

About the working mode of the CS8412 you should switch a input pin of the receiver while enabling the reclocking, check this state change at least. See the datasheet for further info.

Hope you'll solve these issues soon, so at least you can show us the pics!

Cheers

Andrea

PS I'm using a regular 5% type resistor in my I/V.
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Old 4th February 2004, 12:30 PM   #8
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Thanks for the additional info Andy!

Regards,
Bas
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Old 5th February 2004, 08:14 AM   #9
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Old 5th February 2004, 09:39 AM   #10
peterr is offline peterr  Netherlands
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Bas,
(slightly OT)
I am very glad you like your dac so much
I will soon start to build me own dddac1543 and to me the biggest challenge seems the dac tower. How did you build it (I can't make it out in the picture) and how hot does it get?
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Peter
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